Come identificare Audouin's Gull

Per identificare correttamente Audouin's Gull (Ichthyaetus audouinii), controlla ciascuna di queste caratteristiche. Gli uccelli possono essere complicati da riconoscere, perché comportamento, habitat e canto spesso confermano ciò che una sola foto non può.

Dimensioni a colpo d'occhio

Lunghezza

48-52 cm

Apertura alare

125-138 cm

Peso

500-800 g

Caratteristiche fisiche da controllare

1. 1

   Piumaggio

   Colorazione e disegno generale del piumaggio.

   Adult breeding plumage: Pale grey mantle and upperwings, white head, neck, underparts, and tail. Primary feathers are black with white tips, forming a distinctive 'string of pearls' pattern on the trailing edge of the wing. Non-breeding plumage: Similar to breeding, but with faint dusky streaking on the head and nape.

2. 2

   Forma del becco

   Forma e colore del becco, un segno di campo chiave.

   Relatively slender, dark red with a black subterminal band and a yellowish tip. The bill color is a key identification feature.

3. 3

   Colore degli occhi

   Colore dell'iride e segni distintivi sugli occhi.

   Dark brown, with a narrow red orbital ring.

4. 4

   Colore delle zampe

   Colore di zampe e piedi.

   Dull greenish-grey to dark grey, sometimes appearing blackish.

5. 5

   Caratteristiche distintive

   Tratti distintivi che separano questa specie.

   Dark red bill with black band and yellowish tip, pale grey upperparts, dark legs, and the 'string of pearls' pattern on the primaries. Its overall elegant and slender appearance compared to other gulls.

6. 6

   Aspetto giovanile

   Come i giovani si differenziano dagli adulti.

   First-winter birds have a mottled brown and grey plumage, with a dark bill and dark legs. The head and underparts are streaked and mottled. The upperparts are brownish-grey with dark feather centers. Second-winter birds show a gradual transition towards adult plumage, with more grey on the mantle and a paler head, but still retain some brown mottling and a darker bill.

7. 7

   Cambiamenti stagionali

   Variazione del piumaggio tra stagione riproduttiva e non.

   Adults show very subtle seasonal changes. Breeding plumage is slightly cleaner and brighter white on the head and underparts. Non-breeding plumage may have faint dusky streaking on the head and nape, and the bill color might be slightly duller.

8. 8

   Dimorfismo sessuale

   Differenze tra maschi e femmine.

   Minimal; males are typically slightly larger than females, but plumage is identical.

Segni di campo chiave

• Bill Color and Pattern. Look for the distinctive dark red bill with a prominent black subterminal band and a yellowish tip. This is the most reliable field mark for adults.
• Leg Color. Observe the legs, which are dull greenish-grey to dark grey, contrasting with the yellow legs of many other large gulls.
• Mantle Color. Note the pale grey mantle (upperparts), which is lighter than that of Yellow-legged Gulls but darker than Slender-billed Gulls.
• Primary Pattern. In flight, look for the black primary feathers with distinct white tips, creating a 'string of pearls' effect on the trailing edge of the wing.
• Overall Structure and Flight. Audouin's Gull has a more elegant, slender build and a graceful, buoyant flight compared to the heavier, more robust Yellow-legged Gull.
• Juvenile Plumage. First-winter birds are mottled brown and grey with a dark bill and dark legs. Look for the overall shape and flight, and note the habitat preference.

Esplora Audouin's Gull